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Conducting Respiratory Oscillometry in an Outpatient Setting
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Portable open-circuit spirometry systems.

Brittany S Overstreet1, David R Bassett2, Scott E Crouter2

  • 1Department of Kinesiology, Recreation, and Sport Studies, University of Tennessee, Knoxville, TN, USA - bwilker8@vols.utk.edu.

The Journal of Sports Medicine and Physical Fitness
|February 11, 2016
PubMed
Summary

Portable spirometry devices offer reliable measurements of oxygen consumption (VO2). Two systems, Cosmed K4b2 and Oxycon Mobile II, provide valid VO2 estimates across exercise intensities, making them suitable for research and clinical use.

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Area of Science:

  • Exercise Physiology
  • Respiratory Physiology
  • Biomedical Engineering

Background:

  • Review of portable open-circuit spirometry systems.
  • Discussion of their evolution, validity, reliability, and operational principles.
  • Focus on devices measuring oxygen consumption (VO2).

Observation:

  • Eleven portable spirometry devices were evaluated against the Douglas bag method (DBM).
  • Measurements of VO2 were assessed at rest, submaximal, and maximal exercise intensities.
  • Both breath-by-breath and micro-proportional sampling technologies were represented.

Findings:

  • Most devices showed minimal mean differences in resting VO2 measurements compared to DBM.
  • VO2 differences during exercise varied, with ICCs from 0.66-0.99 and CVs from 2.0-14.2%.
  • Cosmed K4b2 and Oxycon Mobile II demonstrated valid VO2 estimates, while MetaMax3B showed slight overestimation at maximal exercise.

Implications:

  • Highlights the importance of device selection for accurate VO2 measurements.
  • Informs researchers and clinicians about the performance of portable spirometry systems.
  • Suggests that portable devices can provide reliable and valid physiological data.